Fix error on values pass to action-event-register (#5708)

Signed-off-by: khanhtc1202 <[email protected]>

Author: khanhtc1202

.github/workflows/publish_image_chart.yaml

@@ -132,9 +132,6 @@ jobs:
           commit-hash: ${{ github.sha }}
           commit-url: https://github.com/pipe-cd/pipecd/commit/${{ github.sha }}
           commit-author: ${{ github.actor }}
-          commit-message: ${{ github.event.head_commit.message }}
-          commit-title: ${{ github.event.head_commit.message }}
-          commit-timestamp: ${{ github.event.head_commit.timestamp }}
           contexts: Source-Commit-URL=https://github.com/pipe-cd/pipecd/commit/${{ github.sha }}
       # Notify PipeCD to trigger update demo environment via EventWatcher.
       - uses: pipe-cd/[email protected]
@@ -147,9 +144,6 @@ jobs:
           commit-hash: ${{ github.sha }}
           commit-url: https://github.com/pipe-cd/pipecd/commit/${{ github.sha }}
           commit-author: ${{ github.actor }}
-          commit-message: ${{ github.event.head_commit.message }}
-          commit-title: ${{ github.event.head_commit.message }}
-          commit-timestamp: ${{ github.event.head_commit.timestamp }}
           contexts: Source-Commit-URL=https://github.com/pipe-cd/pipecd/commit/${{ github.sha }}
 
   release-quickstart-manifests: